ICS8516I Datasheet, PDF (9/13 Pages) Integrated Circuit Systems – LOW SKEW, 1-TO-16 DIFFERENTIAL-TO-LVDS CLOCK DISTRIBUTION CHIP

Integrated
Circuit
Systems, Inc.
ICS8516I
LOW SKEW, 1-TO-16
DIFFERENTIAL-TO-LVDS CLOCK DISTRIBUTION CHIP
DIFFERENTIAL CLOCK INPUT INTERFACE
The CLK /nCLK accepts LVDS, LVPECL, LVHSTL, SSTL, HCSL
and other differential signals. Both V_SWING and V_OH must meet
the V_PP and V_CMR input requirements. Figures 3A to 3E show
interface examples for the HiPerClockS CLK/nCLK input driven
by the most common driver types. The input interfaces sug-
gested here are examples only. Please consult with the vendor
of the driver component to confirm the driver termination re-
quirements. For example in Figure 3A, the input termination
applies for ICS HiPerClockS LVHSTL drivers. If you are using
an LVHSTL driver from another vendor, use their termination
recommendation.
1.8V
Zo = 50 Ohm
Zo = 50 Ohm
LVHSTL
ICS
HiPerClockS
LVHSTL Driver
3.3V
CLK
nCLK _HiPerClockS
Input
R1
R2
50
50
3.3V
Zo = 50 Ohm
LVPECL
Zo = 50 Ohm
3.3V
CLK
nCLK _HiPerClockS
Input
R1
R2
50
50
R3
50
FIGURE 3A. HIPERCLOCKS CLK/nCLK INPUT DRIVEN BY
ICS HIPERCLOCKS LVHSTL DRIVER
FIGURE 3B. HIPERCLOCKS CLK/nCLK INPUT DRIVEN BY
3.3V LVPECL DRIVER
3.3V
Zo = 50 Ohm
LVPECL
Zo = 50 Ohm
3.3V
R3
R4
125
125
3.3V
CLK
nCLK _HiPerClockS
Input
R1
R2
84
84
3.3V
Zo = 50 Ohm
LVDS_Driv er
R1
100
Zo = 50 Ohm
3.3V
CLK
nCLK _{Receiv er}
FIGURE 3C. HIPERCLOCKS CLK/nCLK INPUT DRIVEN BY
3.3V LVPECL DRIVER
FIGURE 3D. HIPERCLOCKS CLK/nCLK INPUT DRIVEN BY
3.3V LVDS DRIVER
3.3V
LVPECL
3.3V
Zo = 50 Ohm
Zo = 50 Ohm
R3
R4
125 125
C1
C2
R5
100 - 200
R6
100 - 200
R1
R2
84
84
3.3V
CLK
nCLK _HiPerClockS
Input
R5,R6 locate near the driver pin.
FIGURE 3E. HIPERCLOCKS CLK/NCLK INPUT DRIVEN BY
3.3V LVPECL DRIVER WITH AC COUPLE
8516FYI
www.icst.com/products/hiperclocks.html
9
REV. A JULY 30, 2004